Stop motion for spinning frames



4 y 1937. F. E. HARDING 2,079,012

STOP MOTION FOR SPINNING FRAMES Filed Feb. 4, 1936- Patented May 4, 1937 0 PATENT OFFICE STOP MOTION FOR SPINNING FRAMES Frank E. Harding, Lawrence, Mass, assignor to Arlington Mills, Lawrence, Mass., a corporation of Massachusetts Application February 4, 1936, Serial No. 62,285

4 Claims.

The present invention relates to stop motions for spinning frames and more particularly to lifter units of the general type disclosed in the patent to Arragg No. 2,044,238, granted June 16, 1936. The principal object of the present invention is to provide improvements in the device of the Arragg application with a particular view to proper drafting of the roving. To this end, the present invention comprises the apparatus hereinafter described and particularly defined in the claims.

In the accompanying drawing, Fig. 1 is a side elevation of the preferred form of lifter unit; Fig. 2 is a rear view; and Figs. 3 and 4 are perspective views on a reduced scale, showing the mode of mounting the delivery roll bracket on the frame.

In the illustrated embodiment of the invention, the roving 6 passes between a positively driven lower back delivery roll 8 and a frictionally driven top back delivery roll l0 and thence through the carrier and front delivery rolls (not shown) in any suitable manner. The. top delivery roll I!) is journaled in the side arms l2 of a yoke-shaped bracket M. The arms l2 are connected by a top plate It. The bracket is pivoted in a manner to be hereinafter described on a pin H3 in the main frame 20 of the lifter unit.

The frame 20 comprises a metal stamping having a back plate 22 adapted to be attached to a rail. which extends across the spinning frame. Near the top, the back plate is provided with a U-shaped recess 26 to accommodate the roving 6.

The parts thus far described are in general similar to those of the Arragg application above referred to. In the Arragg device, the roll It may wear out of true, or it may be improperly supported due to hearing wear or bending of the bracket, with the result that the roll l0 does not contact throughout its length with the lower roll 8, and the roving may be improperly drafted. According to the present invention, slight rocking adjustment of the delivery roll bracket is permitted, whereby the roll may properly accommodate itself to the lower rollB. To this end, the rear edge of the top plate I6 is indented as indicated at 28, and the indentation seats in a small hole 3%] in the upper edge of the frame 20. The pivot pin l8 passes through elongated vertical slots 32 in the side arms l2.

The upper delivery roll is pressed downwardly by a spring 34 surrounding a rod 36 and retained thereon. by a nut 31. The spring bears against a washer 38 on the top plate I4. The plate 14 is provided with a slot 39 to permit assembly of the parts without removal of the spring. The rod 36 is offset, as indicated at 40, the lower end being received in a tongue 42 extending inwardly from the frame 20. .The offset mounting of the rod permits application of the spring pressure at a point considerably forward of the pivot.

As in the Arragg application, the invention is provided with a lifter 44 pivoted on the frame at 46 and padded at its forward edge with a piece of leather 48. The lifter is normally held free of the roll ID by a latch engaging the lower end of the lifter and received within a magnet casing 50, but upon detection of roving breakage, the lifter is released, thereby engaging the pad 48 with the roll ID to pinch the roving and at the same time to lift the roll [0 away'from the lower roll 8.

The indentation 28 allows a limited rocking adjustment about an axis approximately perpendicular to the axis of the roll [0. This insures proper contact of the surface of the roll ID with the lower roll 8, even though the roll I0 may, for any cause, be out of true with respect to the lower roll.

The invention having been thus described,

what is claimed is: 1. A lifter unit for spinning frame stop motions comprising a frame, a delivery roll bracket to receive a delivery roll, spring means acting on the bracket, and means for pivotally mounting the bracket on the frame constructed and arranged to permit a limited rocking adjustment of the bracket about an axis approximately perpendicular to the axis of the roll.

2. A lifter unit for spinning frame stop motions comprising a frame, a; delivery roll bracket to receive a delivery roll, the bracket comprising side arms and a top plate, the side arms having slots, a pivot passing through said slots and the frame, the top plate being formed to engage the frame only at the center to permit a slight rocking adjustment of the bracket, and a spring engaging the top plate topress the bracket downwardly.

3. A lifter unit for spinning frame stop motions comprising a frame, a delivery roll bracket to receive a delivery roll, the bracket comprising side arms and a top plate, the side arms having slots, a pivot passing through said slots and the frame, the top plate being formed with an indentation to engage the frame and to permit a slight rocking adjustment of the bracket, and a spring engaging the top plate to press the bracket downwardly.

4. A lifter unit, for spinning frame stop motions comprising a frame, a delivery roll bracket having a top plate, a tongue extending inwardly from the frame below the top plate, a rod received in the tongue and offset toward the front, the top plate having a slot through which the rod passes, and a spring surrounding the rod and pressing downwardly on the top plate.

FRANK E. HARDING. 

